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In an exclusive interview with TODAY’s Savannah Guthrie, physician and philanthropist Priscilla Chan talks about why she and her husband, Facebook CEO Mark Zuckerberg, plan to donate $3 billion in effort to end all diseases, saying they want to provide a better world for children. She says their daughter Maxima will have a Facebook page, but she will have to wait until she’s 13 years old.Sept. 22, 2016